This commit moves the primitive multi-threading files from vp9
folder to vpx_thread, which will be accessible by all vpx codec.

Change-Id: Ib51e66e9c69801c10631fab56d35a0c0aaed5883

* changes:
  loopfiltersimpleverticaledge_neon: quiet uninit var warnings
  idct_dequant_0_2x_neon: quiet uninit var warnings

Cosmetic/Grammatical corrections in vp9 macro comments

Change-Id: I774b983aff854feb69c7e4442e8731ce4c995645

This commit fixed a mistake in variance calculation.

Thanks to Xintong for spotting the error.

Change-Id: Ia285fc0128c00f0234a73b0a7eba6adc88b8a7de

average improvement ~4x-5x

Change-Id: Iad9c0a296dbc2ea96d000bd009077999ed58a3c5

average improvement ~3x-4x

Change-Id: Idbe4d13a00d05ff8be6559b116f416e42c3b4097

the vector used in vld*_lane_* should be initialized before use

Change-Id: Idce95354737915f6fb4e6b5e8980a050e953036d

average improvement ~3x-4x

Change-Id: If0fdcc34b17437a7e3e7fb4caaf1067bc175f291

the vector used in vld*_lane_* should be initialized before use

Change-Id: I6b791088479fec3bc021ca75cc2af5adcc39d954

Change-Id: I2206ee148a46b234df58f2b623e9f32f26033e04

Change-Id: Id526783fa2e3e9bb31229931b6548ac7a9b2b7e6

Only do the check for resizing if the feature is selected
(i.e., resize_mode = RESIZE_DYNAMIC).

And modify condition for checking to be resize_count >= window,
(since framerate can change).

Change-Id: Idceb4e50956bb965a1492b4993b0dcb393c9be4d

Change-Id: I123db2d20ae65a10e2dec95eec61150e2f69546d

only uint8 is required; each use only loads one value as a uint8
quiets a few type conversion warnings

Change-Id: I03dc0dc0eb01ac23a6e8673daa2b77c6c57bf1b0

- Change default real time speed to -6.
- Add vpxenc_vp9_webm_rt_multithread, which encodes
  niklas_1280_720_30.y4m with 2 to 4 threads using 2 to 4
  tile columns.

Change-Id: I4d86c3360aec67ae5d1ba82eb6e0f0be8068b5af

Reduce boost for segment#2 for low bitrates and low-res.

This change is to reduce the rate overshoot at low bitrates.
No change in behavior, except at the very low bitrates.

Change-Id: I0dbd9d3b6356da5804de94adf10fca6a7a8f8948

~90% faster over 20M pixels

Change-Id: I92d80f66e91e0a870a672cfb5dd29bf1a17cb11a

average improvement ~2x-3x

Change-Id: I76f7fc00c0ffdf2b4ba41bf3819f3b6044bcdeff

Keep the same transform cutoff and partition selection
for speed 5 as in speeds >=6 (non-rd speed settings).

Existing setting for key frame at speed 5 allowed transform size
up to 32x32 on key frames, and did not allow for 4x4 block partition size.
This created more visual artifacts on first few frames.

avgPSNR/overallPSNR/SSIM gains of 0.2/0.7/0.8 for rtc_derf(low-res) set,
and 0/0.7/1.1 gains for rtc set.

Change-Id: I8c139ec6c9bb74e14b4ffbad5f12e94f18a59c0b

configure.sh was setting some Mac OS X options for iOS targets, which
confuses the iOS 9 beta SDK in Xcode 7 when linking libraries.

Additionally, old armv6 media extensions were being enabled on iOS
when they're not needed (we always have Neon since iOS 6). These
broke on iOS 9 SDK which no longer assembles those instructions.

Change-Id: I4e4d2722392ead3382ce96289c03ef1e489799d6

and added to MACROBLOCKD.

Change-Id: I0e60aaa9f84bcc9f2376d71bd934f251baee38db

average improvement ~2x-3x

Change-Id: Idf8be780b8b4228fc91f110a94e4ee1fd9af0163

BUG=https://code.google.com/p/webm/issues/detail?id=1022

Change-Id: I5ae4acac39fd75c56d3feff0716cb52133de3b22